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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 3539 | |
| 3540 | /** |
| 3541 | * Filters list of allowed mime types and file extensions. |
| 3542 | * |
| 3543 | * @since 2.0.0 |
| 3544 | * |
| 3545 | * @param array $t Mime types keyed by the file extension regex corresponding to those types. |
| 3546 | * @param int|WP_User|null $user User ID, User object or null if not provided (indicates current user). |
| 3547 | */ |
| 3548 | return apply_filters( 'upload_mimes', $t, $user ); |
| 3549 | } |
| 3550 | |
| 3551 | /** |
| 3552 | * Display "Are You Sure" message to confirm the action being taken. |
| 3553 | * |
| 3554 | * If the action has the nonce explain message, then it will be displayed |
| 3555 | * along with the "Are you sure?" message. |
| 3556 | * |
| 3557 | * @since 2.0.4 |